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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Expenses    
Research and development costs $ 7,147 $ 8,059
Professional fees 1,613 1,439
Payroll related 2,370 3,655
Other 147 377
Accrued expenses $ 11,277 $ 13,530